Notes
Kirkus Reviews 1989-02-15 (above) implies a collection, "Thirty rib-tickling tales of Wayside School ...".
From NYTimes review of "Wayside School Beneath the Cloud of Doom",
"The original "Sideways Stories from Wayside School" was structured as an anthology of 30 short stories, and each subsequent volume has followed that pattern."
Amazon Look Inside confirms this as a collection of connected stories.
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Library binding
Data from Amazon.com as of 2015-09-30
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Cover image (corrected), cover art, and illustrator from Amazon.com 2018-02-11
-- other data match
-- page-count missing
-- cover image
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The new source at Amazon US is front and back cover images, which do fit this ISBN and imprint (as previous cover image and pressent "Look inside" do not). In particular:
-- front cover credits interior illustrator
-- back cover credits cover design Karen Poprocki, cover art (c)2003 McCauley, cover (c)2004 HarperCollins